package main

import (
	"fmt";
	"flag";
	"net";
	"os";
	"strings";
	"bytes";
)

func main() {
	var (
		host	= "whois.nic.fr";	// Currently only .FR domain names
		port	= "43";
		remote	= host + ":" + port;
		query	string;
		rsp	= make([]byte, 1024);
	)
	if flag.NArg() != 1 {
		fmt.Printf("Usage: whois query\n");
		os.Exit(1);
	}
	query = flag.Arg(0);
	con, error := net.Dial("tcp", "", remote);
	if error != nil {
		fmt.Printf("Cannot connect: %s\n", error);
		os.Exit(1);
	}
	defer con.Close();
	out, error := con.Write(strings.Bytes(query + "\r\n"));
	if error != nil {
		fmt.Printf("Error sending data: %s, out: %d\n", error, out);
		os.Exit(2);
	}
	fmt.Printf("Connection with %s OK\nResponse is:\n", remote);
	for over := false; !over; {
		in, error := con.Read(rsp);
		if error != nil {
			if error == os.EOF {
				over = true
			} else {
				fmt.Printf("Error reading data: %s, in: %d\n", error, in);
				os.Exit(2);
			}
		} else {
			if in == 0 {
				over = true
			} else {
				buf := bytes.NewBuffer(rsp[1:in]);
				fmt.Printf("%s", buf.String());
			}
		}
	}
}